/*Remove header and footer in Salient theme*/
Add this CSS to your Salient Child theme or into your Salient theme options panel
.page-id-xxx #header-space , .page-id-645 #header-outer {
display:none;
}
.page-id-xxx #footer-outer{
display:none;
}
.page-id-xxx #header-secondary-outer {
display: none;
}